Testing transformer



June 9, 1925.

C. M. M CORD TESTING TRANSFORMER Filed AprilV, 1924 Ill Patented June9,1925.

UNITED STATES CLAUDE M. MCCORD, OF RICHMOND HEIGHTS, MISSOURI.

TESTING TRANSFORMER.

Application filed April 7,

To all whom it may concern.

Be it known that I, CLAUDE M. MCCORI),

a citizen of the United States, residing at Richmond Heights, St. LouisCounty, State of Missouri, have invented a new and useful Testing'lranst'ormer, of which the following is a specification.

This invention relates to testing transformers. I

An object of the invention is to provide a testing transformer soconstructed that the expense involved is greatly reduced withoutsacrificing any of the merits ot'v the device. Instead of a laminatedcore which has heretofore been universally employed, so far as I amaware, I use an integrally cast core with the spaced arms thereofintegrally united at their lower ends and each divided into a number ofseparated strips or sections.

Another object oi? the invention is to provide a testing transformercomprising an integrally cast core as distinguished from a laminatedcore. i

Other objects will appear'trom the following (lQSCIiPtlOIl, referencebeing made to the drawing in which I Fig. 1 is a plan view of myimproved testing transformer.

Fig. 2 is an end elevation.

Fig. 3 is a side elevation.

Fig. i is a vertical cross sectional view on the line 4l of Fig. 1. i

Fig. 5 is a view showing one of the spacers removed from the core.

The core comprises an integral casting composed of the upwardlyextending sin flanges 1 and the.downwardly extending side langes 2. Theupper side flanges and the body of the core have transverse slitstherein extending from the upper ends of the side flanges downwardlyentirely through the body of the core, which slits are filled withsheets oi asbestos. A coil 3 is wound around i the body ot the core thatintegrallyunites the strips 1 at opposite sides of the core. The ends ofthe wire of the coil 3 are connected with the binding posts 4. Thestrips 1 and the cross connection upon which the coil 3 is wound areformed in spaced relationship by placing in the mold sheets of asbestos,after which the molten metal is poured into the mold completely fillingthe spaces between the sheets of 1924. Serial N0. 704,628.

asbestos, with the result that the spaced strips 1 are produced. Whenthe core is removed from the mold the protruding portions of theasbestos sheets are removed, while the spaces between the strips 1remain tilled with the asbestos.

I have produced testing transformers in accordance with this inventionand have found that they can be produced at much less cost than theusual laminated transformers, and that they are equally satisfactory andsuccessful in use. The invention obtains all of its intended objects andpurposes in a highly satisfactory manner and is a distinct advance inthe art.

Wl'iat I claim and desire to secure by Letters Patent is:

1. An integrally cast'testing transformer comprising a. body portion,upwardly extending flanges at the sides of the body portion, anddownwardly extending flanges supporting the body portion, said upwardlyextending flanges and body portion having transverse slits therein. 1

2. An integrally east testing transformer comprising a body portion,upwardly extending flanges at the sides of the body portion, anddownwardly extending flanges .S1ll)01tl11 the body Jortion said u)wardly m a l extending flanges and body portion having transverse slitstherein which extend downwardly entirely through the body portion.

3. An integrally cast testing transformer comprising body portion,upwardly extending flanges at the sides of the body portion, downwardlyextending flanges supporting the body portion, said upwardly extendingflanges and body portion having transverse slits therein which extenddownwardly entirely through the body portion, and asbestos sheetsfilling said slits.

4. A testing transformer core comprising an integral casting havingtransverse slits extending downwardly from the upper side thereof, andsheets of non-metallic substance filling said slits from the topdownward.

5. A cast metal core or path subjected to a varying magnetic flux. andcomprising an integral iasting having transverse slits extendingentirely through the body there of from the upper side to the lowerside, and asbestos sheets filling said slits.

CLAUDE M. M CCORD.

